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Electrolyte for lithium manganate power battery

A power battery and electrolyte technology, which is applied to secondary batteries, circuits, electrical components, etc., can solve problems such as capacity attenuation, cycle performance reduction, and manganese dissolution, so as to improve stability, storage time, and safety performance Effect

Inactive Publication Date: 2009-09-23
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium manganese oxide has become the most promising cathode material for lithium-ion batteries due to its abundant resources, low price, and non-toxicity. At high temperature (55°C), the capacity fading is more serious

Method used

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  • Electrolyte for lithium manganate power battery
  • Electrolyte for lithium manganate power battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] LiPF as lithium salt 6 Dissolved in the mixed solvent of ethylene carbonate (EC) / ethyl methyl carbonate (EMC) / diethyl carbonate (DEC) / propylene carbonate (PC) (mass ratio is 30 / 10 / 50 / 10) to obtain a solution, where LiPF 6 The concentration is 1M. Then add vinylene carbonate (VC) to the solution by 2% of the total weight of the electrolyte, add ethanolamine by 0.1% of the total weight of the electrolyte, add biphenyl by 3% of the total weight of the electrolyte, and add biphenyl by 3% of the total weight of the electrolyte. 0.2% of trifluoroethyl phosphorous acid (TTFP) was added to obtain the desired electrolyte.

[0023] The electrolyte was injected into a lithium manganese oxide soft-pack battery with a single capacity of 10Ah. After formation and capacity separation, the normal temperature cycle performance, high temperature 60°C cycle performance and safety performance of the battery were tested.

[0024] figure 1 The middle curve is the normal-temperature cycle...

Embodiment 2

[0028] LiPF as lithium salt 6 Dissolved in the mixed solvent of ethylene carbonate (EC) / ethyl methyl carbonate (EMC) / diethyl carbonate (DEC) / propylene carbonate (PC) (mass ratio is 30 / 10 / 50 / 10) to obtain a solution, where LiPF 6 The concentration is 1M. Then add vinylene carbonate (VC) to the solution by 1% of the total weight of the electrolyte, add 1,3-propiolactone sulfonate (1,3-PS) by 2% of the total weight of the electrolyte, and Hexamethyldisilazane was added at 0.05% of the total weight of the electrolyte, biphenyl was added at 5% of the total weight of the electrolyte, and pyrimidine was added at 0.2% of the total weight of the electrolyte to obtain the desired electrolyte.

Embodiment 3

[0030] LiPF as lithium salt 6 Dissolved in the mixed solvent of ethylene carbonate (EC) / ethyl methyl carbonate (EMC) / diethyl carbonate (DEC) / propylene carbonate (PC) (mass ratio is 30 / 10 / 50 / 10) to obtain a solution, where LiPF 6 The concentration is 1M. Then add vinylene carbonate (VC) to the solution by 1% of the total weight of the electrolyte, add 1,4-sulfonic acid butyrolactone (1,4-BS) by 2% of the total weight of the electrolyte, and Add heptamethyldisilazane to 0.01% of the total weight of the electrolyte, add 3-chloroanisole to 7% of the total weight of the electrolyte, and add phenylisocyanate to 2% of the total weight of the electrolyte to obtain the desired electrolyte liquid.

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PUM

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Abstract

The invention discloses an electrolyte for a lithium manganate power battery. The electrolyte comprises lithium salt and nonaqueous organic solvent and also comprises 0.5-5 of filming additive, 2-10 of anti-overcharge additive, 0.01-0.5 of additive capable of controlling acidity and water content and 0.1-5 of lithium salt stabilizer according to the weight percentage. The electrolyte selects the nonaqueous organic solvent with a high boiling point and adds functional additives such as the filming additive, the anti-overcharge additive, the additive capable of controlling the acidity and the water content, the lithium salt stabilizer, and the like so that the lithium manganate power battery adopting the electrolyte has excellent safety performance, high-temperature performance and recycle service life.

Description

technical field [0001] The invention relates to a lithium ion battery electrolyte, in particular to an electrolyte for a lithium manganate power battery. Background technique [0002] In the past ten years, lithium-ion batteries have been widely used in portable electrical appliances such as mobile communications, video cameras, cameras, repeaters, MP3 players, and are increasing at a rate of 20% every year. There are four types of power batteries commonly used at present: lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries and lithium-ion batteries. Lithium-ion batteries are generally considered to have the following advantages: large specific energy; high specific power; small self-discharge; no memory effect; good cycle characteristics; fast discharge and high efficiency; wide operating temperature range; no environmental pollution, etc. It is expected to enter the ranks of the best power supply in the 21st century. [0003] At present, the glo...

Claims

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Application Information

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IPC IPC(8): H01M10/40
CPCY02E60/122
Inventor 李永坤刘建生杨春巍张若昕张利萍
Owner GUANGZHOU TINCI MATERIALS TECH
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